This discussion may contain spoilers!
As many of you know, Telltale has released a new screenshot on the twitter (LINK:
Let's look at the background. Not what any of the character are doing. They are in a forest on a broken down railroad track or minecart track. If you look directly behind Clem, you can easily see that there are rails. The track looks like it is bridging across something. Mountains, river, or a ravine. Also if you look on the bridge, you can see a Handcar (I think that's what it's called) or a Minecart. A Handcar is basically one of those tiny train things that you push a lever back and forth on to ride on tracks. Also, if you look to the right of Luke (Our right, not his), you can see something behind the big rock. I think it might be a car. The only other thing I could say about the background is that they may be near the Ski Resort where the other group is because I said the track may be bridging between mountains. They are also in probably the same forest as the Cabin is in. So they are relatively near the Cabin.
Now to the people. Clem is basically going to hammer a walker that is most likely after someone like Sarah or Rebecca. Then Luke is not looking at Clem but something behind her. It may be walkers sneaking up and he's going there with his blade.
That's basically it. I have analyzed the photo as much as I could. Thanks for reading.